Answer: B) Wood Shavings
Reason/Explanation:
Notice what options A, C, and D have on common. Ice, salt and sugar. Those are all dissolvable. Insoluble means un-able to dissolve. It can't dissolve. Wood shavings can't dissolve in water. They will just float. Sugar, salt and ice will all dissolve. Wood shavings won't.
-DustinBR
        
                    
             
        
        
        
Ammonium chloride is the correct name for NH4CL
        
                    
             
        
        
        
Answer:
SEE BELOW
Explanation:
Given   500 cm^3 = V1    760 mm = P1     (760*2) = P2 
Required   V2 
P1V1 = P2V2
RE-ARRANGE  TO    P1V1/P2 = V2
(760)(500) /(760*2) = V2 
V2 = 250 ML
 
        
                    
             
        
        
        
Name for the compound HF is Hydrogen fluoride.
Hope this helps!